Obs. : 2014-01-03 Planet Ly alpha (photons/cm^2/sec) Mercury 3.869e+11 Venus 3.869e+11 Earth 4.104e+11 Mars 4.410e+11 Jupiter 4.195e+11 Saturn 4.291e+11 Uranus 3.925e+11 Neptune 3.822e+11 Pluto 3.944e+11